ScaffoldBench

RunSonnet 5.5repeat 1

Plan-execute-verify on Add checked bags and collect the right fee

claude-sonnet-5-5__plan-execute-verify__airline-easy__r1

Score

1.000

passed
design ran as designed
Cost
$0.078
Latency
27.1s
setup 0.0s, grading 0.0s
Turns
17
Tool calls
12
Subagents
0
Tokens in / out
56k / 2.4k
41,687 read from cache

Did the design run?

every check held
  • Run completed: heldharness.run-completedThe environment was built, the architecture returned and grading finished, none of them throwing.
  • No API failures: heldharness.apiNo model call failed at the API.
  • Every call ended: heldharness.calls-endedEvery call ended with a result, or was stopped by the run's own limits.
  • No harness tool denied: heldharness.harness-toolsThe sandbox guard never denied a harness tool, nor a tool the session itself offered.
  • Tool servers connected: heldharness.mcp-connectedEvery tool server the harness gave a call was connected when the session started.
  • No foreign tool servers: heldharness.mcp-hermeticNo call loaded a tool server the harness did not give it.
  • Builtin tools: heldharness.builtin-toolsA check recorded with the run.
  • Structured replies arrived: heldharness.structured-outputEvery call that asked for structured output and ran to the end got it.
  • No silent fallbacks: heldharness.not-degradedNo phase fell back on a default (an empty plan, a default winner) instead of its output.
  • The plan was a plan: heldplan-execute-verify.planThe planner’s reply was read through its schema and held at least one step.
  • Every verdict was read: heldplan-execute-verify.verdictsEvery review round ended with a verdict read from the schema reply, not a default.
  • The loop did what its verdicts said: heldplan-execute-verify.loopEvery verdict that called for a revision got one, and nothing was revised without such a verdict.
  • Each call was shown the right tools: heldplan-execute-verify.toolsThe planner was shown no tools, the verifier the read-only ones, and the executor and reviser the full toolset.

Phases

Plan: 0.0s to 7.7s, finished, 0 tool calls, $0.017
Execute: 7.7s to 18.4s, finished, 7 tool calls, $0.031
Verify: 18.4s to 27.1s, finished, 5 tool calls, $0.030

Drawn from the phase records: timing and cost per call, no tool calls or messages.

PhaseDurationCostTurnsToolsModel
Plan7.7s$0.01720claude-sonnet-5-5
Execute10.7s$0.03187claude-sonnet-5-5
Verify8.7s$0.03075claude-sonnet-5-5

The call-by-call replay is not published for this run. Traces are large, so the repository keeps 9 of this run set’s 900 and leaves the rest out; the score, phases and final answer on this page come from the committed run record.

Runs you can replay

Record this cell yourself: npm run bench -- run --strategies plan-execute-verify --tasks airline-easy --models claude-sonnet-5-5 --repeats 1

Score breakdown

  • passReservation holds three checked bags and is otherwise untouched
    1.00weight 0.43

    checked_bags=3, status=confirmed

  • passExactly one baggage fee, for the bags beyond the free allowance
    1.00weight 0.57

    expected 4500 cents for 1 chargeable bag(s), charged 4500

Penalties

No penalties were applied.

Scorer metadata

tool calls
12
failed tool calls
0
distinct tools
7

Final answer

I added two checked bags to R1042 and charged Rosa Mendel $45.00 for them.

  • Bags: The reservation went from 1 checked bag to 3, which is the maximum allowed.
  • Why $45.00: Rosa's economy fare includes 1 free bag and her silver status adds 1 more, so 2 are free. She already had one, so the first new bag is free. The second new bag is the only chargeable one, at the first-chargeable-bag price of $45.00.
  • Ledger: One baggage_fee entry, L1, for $45.00. I didn't change anything else.

I didn't re-read the reservation or ledger afterwards. The tool confirmations showed bags 1 → 3 and the $45.00 charge.

The flight AS420 (SFO→SEA) is dated 2026-08-11, which is before today's date of 2026-10-04. The system still shows it as "scheduled", so I went ahead. Someone should check the date, since that flight may already have departed.

Provenance of the numbers on this page

run set
scaffold-or-scale-v1
models
Haiku 4.5, Sonnet 5.5, Opus 5.5
effort
high
repeats
2
fixtures
replay
runs
900 / 900
strategy cost
$354.44
judge cost
$9.19
wall clock
9h 48m
git
fce5807b2d

Cost excludes judge calls, which are tracked separately so a scoring model never flatters or penalises an architecture. Every figure on this site is read from results/ at build time.